| 1 | /* |
| 2 | ** Copyright 2000-2006 Double Precision, Inc. See COPYING for |
| 3 | ** distribution information. |
| 4 | */ |
| 5 | |
| 6 | #include "auth.h" |
| 7 | #include "courierauthstaticlist.h" |
| 8 | #include "courierauthsasl.h" |
| 9 | #include <stdio.h> |
| 10 | #include <stdlib.h> |
| 11 | #include <string.h> |
| 12 | #if HAVE_UNISTD_H |
| 13 | #include <unistd.h> |
| 14 | #endif |
| 15 | #include <fcntl.h> |
| 16 | #include <sys/types.h> |
| 17 | #include <sys/socket.h> |
| 18 | #include <sys/un.h> |
| 19 | #include <sys/time.h> |
| 20 | #if HAVE_SYS_SELECT_H |
| 21 | #include <sys/select.h> |
| 22 | #endif |
| 23 | #include <unistd.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <stdio.h> |
| 26 | #include <errno.h> |
| 27 | #include "authdaemonrc.h" |
| 28 | #include "numlib/numlib.h" |
| 29 | |
| 30 | static int TIMEOUT_SOCK=10, |
| 31 | TIMEOUT_WRITE=10, |
| 32 | TIMEOUT_READ=30; |
| 33 | |
| 34 | |
| 35 | static int s_connect(int sockfd, |
| 36 | const struct sockaddr *addr, |
| 37 | size_t addr_s, |
| 38 | time_t connect_timeout) |
| 39 | { |
| 40 | fd_set fdr; |
| 41 | struct timeval tv; |
| 42 | int rc; |
| 43 | |
| 44 | #ifdef SOL_KEEPALIVE |
| 45 | setsockopt(sockfd, SOL_SOCKET, SOL_KEEPALIVE, |
| 46 | (const char *)&dummy, sizeof(dummy)); |
| 47 | #endif |
| 48 | |
| 49 | #ifdef SOL_LINGER |
| 50 | { |
| 51 | struct linger l; |
| 52 | |
| 53 | l.l_onoff=0; |
| 54 | l.l_linger=0; |
| 55 | |
| 56 | setsockopt(sockfd, SOL_SOCKET, SOL_LINGER, |
| 57 | (const char *)&l, sizeof(l)); |
| 58 | } |
| 59 | #endif |
| 60 | |
| 61 | /* |
| 62 | ** If configuration says to use the kernel's timeout settings, |
| 63 | ** just call connect, and be done with it. |
| 64 | */ |
| 65 | |
| 66 | if (connect_timeout == 0) |
| 67 | return ( connect(sockfd, addr, addr_s)); |
| 68 | |
| 69 | /* Asynchronous connect with timeout. */ |
| 70 | |
| 71 | if (fcntl(sockfd, F_SETFL, O_NONBLOCK) < 0) return (-1); |
| 72 | |
| 73 | if ( connect(sockfd, addr, addr_s) == 0) |
| 74 | { |
| 75 | /* That was easy, we're done. */ |
| 76 | |
| 77 | if (fcntl(sockfd, F_SETFL, 0) < 0) return (-1); |
| 78 | return (0); |
| 79 | } |
| 80 | |
| 81 | if (errno != EINPROGRESS) |
| 82 | return -1; |
| 83 | |
| 84 | /* Wait for the connection to go through, until the timeout expires */ |
| 85 | |
| 86 | FD_ZERO(&fdr); |
| 87 | FD_SET(sockfd, &fdr); |
| 88 | tv.tv_sec=connect_timeout; |
| 89 | tv.tv_usec=0; |
| 90 | |
| 91 | rc=select(sockfd+1, 0, &fdr, 0, &tv); |
| 92 | if (rc < 0) return (-1); |
| 93 | |
| 94 | if (!FD_ISSET(sockfd, &fdr)) |
| 95 | { |
| 96 | errno=ETIMEDOUT; |
| 97 | return (-1); |
| 98 | } |
| 99 | |
| 100 | { |
| 101 | int gserr; |
| 102 | socklen_t gslen = sizeof(gserr); |
| 103 | |
| 104 | if (getsockopt(sockfd, SOL_SOCKET, |
| 105 | SO_ERROR, |
| 106 | (char *)&gserr, &gslen)==0) |
| 107 | { |
| 108 | if (gserr == 0) |
| 109 | return 0; |
| 110 | |
| 111 | errno=gserr; |
| 112 | } |
| 113 | } |
| 114 | return (-1); |
| 115 | } |
| 116 | |
| 117 | static int opensock() |
| 118 | { |
| 119 | int s=socket(PF_UNIX, SOCK_STREAM, 0); |
| 120 | struct sockaddr_un skun; |
| 121 | |
| 122 | skun.sun_family=AF_UNIX; |
| 123 | strcpy(skun.sun_path, AUTHDAEMONSOCK); |
| 124 | |
| 125 | if (s < 0) |
| 126 | { |
| 127 | perror("CRIT: authdaemon: socket() failed"); |
| 128 | return (-1); |
| 129 | } |
| 130 | |
| 131 | { |
| 132 | const char *p=getenv("TIMEOUT_SOCK"); |
| 133 | int n=atoi(p ? p:"0"); |
| 134 | |
| 135 | if (n > 0) |
| 136 | TIMEOUT_SOCK=n; |
| 137 | } |
| 138 | |
| 139 | { |
| 140 | const char *p=getenv("TIMEOUT_READ"); |
| 141 | int n=atoi(p ? p:"0"); |
| 142 | |
| 143 | if (n > 0) |
| 144 | TIMEOUT_READ=n; |
| 145 | } |
| 146 | |
| 147 | { |
| 148 | const char *p=getenv("TIMEOUT_WRITE"); |
| 149 | int n=atoi(p ? p:"0"); |
| 150 | |
| 151 | if (n > 0) |
| 152 | TIMEOUT_WRITE=n; |
| 153 | } |
| 154 | |
| 155 | if (s_connect(s, (const struct sockaddr *)&skun, sizeof(skun), |
| 156 | TIMEOUT_SOCK)) |
| 157 | { |
| 158 | perror("ERR: authdaemon: s_connect() failed"); |
| 159 | if (errno == ETIMEDOUT || errno == ECONNREFUSED) |
| 160 | fprintf(stderr, "ERR: [Hint: perhaps authdaemond is not running?]\n"); |
| 161 | close(s); |
| 162 | return (-1); |
| 163 | } |
| 164 | return (s); |
| 165 | } |
| 166 | |
| 167 | static int writeauth(int fd, const char *p, unsigned pl) |
| 168 | { |
| 169 | fd_set fds; |
| 170 | struct timeval tv; |
| 171 | |
| 172 | while (pl) |
| 173 | { |
| 174 | int n; |
| 175 | |
| 176 | FD_ZERO(&fds); |
| 177 | FD_SET(fd, &fds); |
| 178 | tv.tv_sec=TIMEOUT_WRITE; |
| 179 | tv.tv_usec=0; |
| 180 | if (select(fd+1, 0, &fds, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 181 | return (-1); |
| 182 | n=write(fd, p, pl); |
| 183 | if (n <= 0) return (-1); |
| 184 | p += n; |
| 185 | pl -= n; |
| 186 | } |
| 187 | return (0); |
| 188 | } |
| 189 | |
| 190 | static void readauth(int fd, char *p, unsigned pl, const char *term) |
| 191 | { |
| 192 | time_t end_time, curtime; |
| 193 | unsigned len = 0, tlen = strlen(term); |
| 194 | |
| 195 | --pl; |
| 196 | |
| 197 | time(&end_time); |
| 198 | end_time += TIMEOUT_READ; |
| 199 | |
| 200 | while (pl) |
| 201 | { |
| 202 | int n; |
| 203 | fd_set fds; |
| 204 | struct timeval tv; |
| 205 | |
| 206 | time(&curtime); |
| 207 | if (curtime >= end_time) |
| 208 | break; |
| 209 | |
| 210 | FD_ZERO(&fds); |
| 211 | FD_SET(fd, &fds); |
| 212 | tv.tv_sec=end_time - curtime; |
| 213 | tv.tv_usec=0; |
| 214 | if (select(fd+1, &fds, 0, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 215 | break; |
| 216 | |
| 217 | n=read(fd, p, pl); |
| 218 | if (n <= 0) |
| 219 | break; |
| 220 | p += n; |
| 221 | pl -= n; |
| 222 | /* end-of-message detection for authpipe */ |
| 223 | len += n; |
| 224 | if (len >= tlen && strncmp(p-tlen, term, tlen) == 0) |
| 225 | break; |
| 226 | else if (len == 5 && strncmp(p-5, "FAIL\n", 5) == 0) |
| 227 | break; |
| 228 | } |
| 229 | *p=0; |
| 230 | } |
| 231 | |
| 232 | int _authdaemondopasswd(int wrfd, int rdfd, char *buffer, int bufsiz) |
| 233 | { |
| 234 | if (writeauth(wrfd, buffer, strlen(buffer))) |
| 235 | return 1; |
| 236 | |
| 237 | readauth(rdfd, buffer, bufsiz, "\n"); |
| 238 | |
| 239 | if (strcmp(buffer, "OK\n")) |
| 240 | { |
| 241 | errno=EPERM; |
| 242 | return -1; |
| 243 | } |
| 244 | return 0; |
| 245 | } |
| 246 | |
| 247 | int authdaemondopasswd(char *buffer, int bufsiz) |
| 248 | { |
| 249 | int s=opensock(); |
| 250 | int rc; |
| 251 | |
| 252 | if (s < 0) |
| 253 | return (1); |
| 254 | rc = _authdaemondopasswd(s, s, buffer, bufsiz); |
| 255 | close(s); |
| 256 | return rc; |
| 257 | } |
| 258 | |
| 259 | int _authdaemondo(int wrfd, int rdfd, const char *authreq, |
| 260 | int (*func)(struct authinfo *, void *), void *arg) |
| 261 | { |
| 262 | char buf[BUFSIZ]; |
| 263 | char *p, *q, *r; |
| 264 | struct authinfo a; |
| 265 | uid_t u; |
| 266 | |
| 267 | if (writeauth(wrfd, authreq, strlen(authreq))) |
| 268 | { |
| 269 | return (1); |
| 270 | } |
| 271 | |
| 272 | readauth(rdfd, buf, sizeof(buf), "\n.\n"); |
| 273 | memset(&a, 0, sizeof(a)); |
| 274 | a.homedir=""; |
| 275 | p=buf; |
| 276 | while (*p) |
| 277 | { |
| 278 | for (q=p; *q; q++) |
| 279 | if (*q == '\n') |
| 280 | { |
| 281 | *q++=0; |
| 282 | break; |
| 283 | } |
| 284 | if (strcmp(p, ".") == 0) |
| 285 | { |
| 286 | return ( (*func)(&a, arg)); |
| 287 | } |
| 288 | if (strcmp(p, "FAIL") == 0) |
| 289 | { |
| 290 | errno=EPERM; |
| 291 | return (-1); |
| 292 | } |
| 293 | r=strchr(p, '='); |
| 294 | if (!r) |
| 295 | { |
| 296 | p=q; |
| 297 | continue; |
| 298 | } |
| 299 | *r++=0; |
| 300 | |
| 301 | if (strcmp(p, "USERNAME") == 0) |
| 302 | a.sysusername=r; |
| 303 | else if (strcmp(p, "UID") == 0) |
| 304 | { |
| 305 | u=atol(r); |
| 306 | a.sysuserid= &u; |
| 307 | } |
| 308 | else if (strcmp(p, "GID") == 0) |
| 309 | { |
| 310 | a.sysgroupid=atol(r); |
| 311 | } |
| 312 | else if (strcmp(p, "HOME") == 0) |
| 313 | { |
| 314 | a.homedir=r; |
| 315 | } |
| 316 | else if (strcmp(p, "ADDRESS") == 0) |
| 317 | { |
| 318 | a.address=r; |
| 319 | } |
| 320 | else if (strcmp(p, "NAME") == 0) |
| 321 | { |
| 322 | a.fullname=r; |
| 323 | } |
| 324 | else if (strcmp(p, "MAILDIR") == 0) |
| 325 | { |
| 326 | a.maildir=r; |
| 327 | } |
| 328 | else if (strcmp(p, "QUOTA") == 0) |
| 329 | { |
| 330 | a.quota=r; |
| 331 | } |
| 332 | else if (strcmp(p, "PASSWD") == 0) |
| 333 | { |
| 334 | a.passwd=r; |
| 335 | } |
| 336 | else if (strcmp(p, "PASSWD2") == 0) |
| 337 | { |
| 338 | a.clearpasswd=r; |
| 339 | } |
| 340 | else if (strcmp(p, "OPTIONS") == 0) |
| 341 | { |
| 342 | a.options=r; |
| 343 | } |
| 344 | p=q; |
| 345 | } |
| 346 | errno=EIO; |
| 347 | return (1); |
| 348 | } |
| 349 | |
| 350 | int authdaemondo(const char *authreq, |
| 351 | int (*func)(struct authinfo *, void *), void *arg) |
| 352 | { |
| 353 | int s=opensock(); |
| 354 | int rc; |
| 355 | |
| 356 | if (s < 0) |
| 357 | { |
| 358 | return (1); |
| 359 | } |
| 360 | rc = _authdaemondo(s, s, authreq, func, arg); |
| 361 | close(s); |
| 362 | return rc; |
| 363 | } |
| 364 | |
| 365 | void auth_daemon_cleanup() |
| 366 | { |
| 367 | } |
| 368 | |
| 369 | struct enum_getch { |
| 370 | char buffer[BUFSIZ]; |
| 371 | char *buf_ptr; |
| 372 | size_t buf_left; |
| 373 | }; |
| 374 | |
| 375 | #define getauthc(fd,eg) ((eg)->buf_left-- ? \ |
| 376 | (unsigned char)*((eg)->buf_ptr)++:\ |
| 377 | fillgetauthc((fd),(eg))) |
| 378 | |
| 379 | static int fillgetauthc(int fd, struct enum_getch *eg) |
| 380 | { |
| 381 | time_t end_time, curtime; |
| 382 | |
| 383 | time(&end_time); |
| 384 | end_time += 60; |
| 385 | |
| 386 | for (;;) |
| 387 | { |
| 388 | int n; |
| 389 | fd_set fds; |
| 390 | struct timeval tv; |
| 391 | |
| 392 | time(&curtime); |
| 393 | if (curtime >= end_time) |
| 394 | break; |
| 395 | |
| 396 | FD_ZERO(&fds); |
| 397 | FD_SET(fd, &fds); |
| 398 | tv.tv_sec=end_time - curtime; |
| 399 | tv.tv_usec=0; |
| 400 | if (select(fd+1, &fds, 0, 0, &tv) <= 0 || !FD_ISSET(fd, &fds)) |
| 401 | break; |
| 402 | |
| 403 | n=read(fd, eg->buffer, sizeof(eg->buffer)); |
| 404 | if (n <= 0) |
| 405 | break; |
| 406 | |
| 407 | eg->buf_ptr=eg->buffer; |
| 408 | eg->buf_left=n; |
| 409 | |
| 410 | --eg->buf_left; |
| 411 | return (unsigned char)*(eg->buf_ptr)++; |
| 412 | } |
| 413 | return EOF; |
| 414 | } |
| 415 | |
| 416 | static int readline(int fd, struct enum_getch *eg, |
| 417 | char *buf, |
| 418 | size_t bufsize) |
| 419 | { |
| 420 | if (bufsize == 0) |
| 421 | return EOF; |
| 422 | |
| 423 | while (--bufsize) |
| 424 | { |
| 425 | int ch=getauthc(fd, eg); |
| 426 | |
| 427 | if (ch == EOF) |
| 428 | return -1; |
| 429 | if (ch == '\n') |
| 430 | break; |
| 431 | |
| 432 | *buf++=ch; |
| 433 | } |
| 434 | *buf=0; |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | int _auth_enumerate(int wrfd, int rdfd, |
| 439 | void(*cb_func)(const char *name, |
| 440 | uid_t uid, |
| 441 | gid_t gid, |
| 442 | const char *homedir, |
| 443 | const char *maildir, |
| 444 | const char *options, |
| 445 | void *void_arg), |
| 446 | void *void_arg) |
| 447 | { |
| 448 | static char cmd[]="ENUMERATE\n"; |
| 449 | struct enum_getch eg; |
| 450 | char linebuf[BUFSIZ]; |
| 451 | |
| 452 | if (writeauth(wrfd, cmd, sizeof(cmd)-1)) |
| 453 | { |
| 454 | return 1; |
| 455 | } |
| 456 | |
| 457 | eg.buf_left=0; |
| 458 | |
| 459 | while (readline(rdfd, &eg, linebuf, sizeof(linebuf)) == 0) |
| 460 | { |
| 461 | char *p; |
| 462 | const char *name; |
| 463 | uid_t uid; |
| 464 | gid_t gid; |
| 465 | const char *homedir; |
| 466 | const char *maildir; |
| 467 | const char *options; |
| 468 | |
| 469 | if (strcmp(linebuf, ".") == 0) |
| 470 | { |
| 471 | (*cb_func)(NULL, 0, 0, NULL, NULL, NULL, void_arg); |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | p=strchr(linebuf, '#'); |
| 476 | if (p) *p=0; |
| 477 | |
| 478 | p=strchr(linebuf, '\t'); |
| 479 | |
| 480 | if (p) |
| 481 | { |
| 482 | name=linebuf; |
| 483 | *p++=0; |
| 484 | |
| 485 | uid=libmail_atouid_t(p); |
| 486 | p=strchr(p, '\t'); |
| 487 | if (uid && p) |
| 488 | { |
| 489 | *p++=0; |
| 490 | gid=libmail_atogid_t(p); |
| 491 | p=strchr(p, '\t'); |
| 492 | if (gid && p) |
| 493 | { |
| 494 | *p++=0; |
| 495 | homedir=p; |
| 496 | p=strchr(p, '\t'); |
| 497 | maildir=NULL; |
| 498 | options=NULL; |
| 499 | |
| 500 | if (p) |
| 501 | { |
| 502 | *p++=0; |
| 503 | maildir=p; |
| 504 | p=strchr(p, '\t'); |
| 505 | |
| 506 | if (p) |
| 507 | { |
| 508 | *p++=0; |
| 509 | options=p; |
| 510 | p=strchr(p, '\t'); |
| 511 | if (p) *p=0; |
| 512 | } |
| 513 | } |
| 514 | |
| 515 | |
| 516 | (*cb_func)(name, uid, gid, homedir, |
| 517 | maildir, options, void_arg); |
| 518 | } |
| 519 | } |
| 520 | } |
| 521 | } |
| 522 | return 1; |
| 523 | } |
| 524 | |
| 525 | void auth_enumerate( void(*cb_func)(const char *name, |
| 526 | uid_t uid, |
| 527 | gid_t gid, |
| 528 | const char *homedir, |
| 529 | const char *maildir, |
| 530 | const char *options, |
| 531 | void *void_arg), |
| 532 | void *void_arg) |
| 533 | { |
| 534 | int s=opensock(); |
| 535 | |
| 536 | if (s < 0) |
| 537 | return; |
| 538 | |
| 539 | _auth_enumerate(s, s, cb_func, void_arg); |
| 540 | |
| 541 | close(s); |
| 542 | } |